Urachus

Urachus
Vertical section of bladder, penis, and urethra. Urachus is seen at top
Urachus is #1
Identifiers
MeSHD014497
Anatomical terminology

The urachus forms from the distal end of the allantois in the embryo, and develops into a closed cord between the base of the bladder, and the navel. It drains the bladder of the fetus that joins and runs within the umbilical cord. The fibrous remnant lies in the space of Retzius, between the transverse fascia anteriorly and the peritoneum posteriorly. At birth, the urachus develops into the median umbilical ligament.

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